Genesis Water Technologies GWT-P-10P-1 Polypropylene String-Wound Depth Replacement Sediment Filter Unit with One Micron Rating Measuring 10-Inch X 2.5-Inch Stringwound polypropylene replacement sediment filter 1 micron rated to remove even fine particulates Excellent for prefiltration to protect higher value filters and reverse osmosis units Standard 10 inch by 2.5 inch size Proudly made in America